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erdos_160.known_upper
Specification
On [Mathoverflow](https://mathoverflow.net/a/410815) user [leechlattice](https://mathoverflow.net/users/125498/leechlattice) shows that $h(n) \ll n^{\frac 2 3}$.
Lean 4 Statement
theorem erdos_160.known_upper :
(fun n => (erdos_160.h n : ℝ)) =O[atTop] fun n => (n : ℝ) ^ ((2 : ℝ) / 3)
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